That's a total misrepresentation of that article, disingenuous at best. It comes down to 'watts are an over simplification'. Which if you've paid any attention to any of the substantive light discussion (hint, there's a sub forum for it), you'd know. In fact, many of the points made in that article bolster what most of us have been saying here.
For those playing along at home and want to see the actual page, it's here. Funny that the OP didn't bother to include it.
LED grow lights for growing plants, especially for starting seedlings, is energy efficient, but which one should you buy? Should you buy based on watts? Which LED wavelengths work best for plants? Understand these myths before buying a new LED grow light.
www.gardenmyths.com
Legit lighting companies give you all the info about the lamp and their efficiency and spectrum.
For example these are what I use:
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Feel free to post up the data on the lights you're using. Watts are not a lie, they're a single information point. And they 'count' along with other information.